QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

7 km SSW of Arroyo, Puerto Rico

· 15 km deep · released about 22 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayama Municipio 9 kmArroyo Municipio 9 kmPatillas Municipio 15 kmSalinas Municipio 19 kmCayey Municipio 23 kmMaunabo Municipio 23 kmSan Lorenzo Municipio 29 kmYabucoa Municipio 30 kmCidra Municipio 31 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 1.9 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Guayama Municipio, 9 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2592 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 22 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 680,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 480,000× the energy of this one
  3. Around the size people start to feel M 3.0 43× the energy of this one
  4. This earthquake M 1.9 about 22 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 17.9078, -66.0935. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guayama Municipio, PR 9 km (5 mi) SSE of here earthquakes near Guayama Municipio
Arroyo Municipio, PR 9 km (6 mi) SW of here earthquakes near Arroyo Municipio
Patillas Municipio, PR 15 km (9 mi) SW of here earthquakes near Patillas Municipio
Salinas Municipio, PR 19 km (12 mi) ESE of here earthquakes near Salinas Municipio
Cayey Municipio, PR 23 km (14 mi) SSE of here earthquakes near Cayey Municipio
Maunabo Municipio, PR 23 km (14 mi) WSW of here earthquakes near Maunabo Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

38 earthquakes have been recorded within 50 km since this one.

  1. 1.6 2 km SE of El Ojo, Puerto Rico
  2. 1.9 11 km SSW of Potala Pastillo, Puerto Rico
  3. 1.7 1 km W of Jauca, Puerto Rico
  4. 2.1 0 km N of Salinas, Puerto Rico
  5. 2.3 10 km S of Salinas, Puerto Rico
  6. 2.2 4 km ESE of Bayamon, Puerto Rico
  7. 1.6 10 km SSW of Potala Pastillo, Puerto Rico
  8. 1.8 28 km SE of Emajagua, Puerto Rico
  9. 1.8 27 km SE of Emajagua, Puerto Rico
  10. 1.6 2 km NNW of Jagual, Puerto Rico
  11. 1.8 28 km SW of Esperanza, Puerto Rico
  12. 1.6 1 km NNE of Parcelas Nuevas, Puerto Rico
  13. 1.9 26 km ESE of El Negro, Puerto Rico
  14. 1.7 25 km SE of Emajagua, Puerto Rico
  15. 1.7 26 km SE of Emajagua, Puerto Rico

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 4.6 on 2016-12-05 — it released about 11,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.